Not $, but fuel! I went on a local BMW drive and it was about 20-35 degrees out and the car was extremly rich. I have no AFR guage but I used a little over 3/4 tank going maybe 150 miles.

Normal driving it felt fine, but once you tried to get on it at all it felt like it was choking on fuel. I know it's probably a WUR issue, but maybe some one can help narrow it down for me, or point me in the right direction.